VOLTAGE CONTROL OSCILLATION CIRCUIT

摘要

A voltage control oscillation circuit includes: resistors (R1, R2); a positive feedback circuit of oscillation pair of transistors (M1, M2); variable-capacity diodes (D1, D2); and bias circuits (M4, M5) giving a fixed bias voltage to the variable-capacity diodes (D1, D2). By changing the capacity value of the variable-capacity diodes (D1, D2) by a synchronous voltage V_T so as to control the oscillation frequency, it is possible to configure a voltage control oscillator without using an inductor not appropriate for an IC or constant current source which tends to cause a large current noise.